Improvement in bench planes



@gnith faire atrnt @frn IMPROVEMENT IN BENCH PLANES.

@The .rlganle referat tu it tigen tetta ttent mit making and nf I'Igenime.

TO ALL WHOM IT MAY OONCERN:

Be it known that I, CHARLES H. SAwYER, of Hollis, in the county of York,and State of Maine, have invented a new and useful Improvement in PlaneStocks; and I'do hereby declare the following to be a full, clear, andexact description thereof, which will enable others to make and use myinvention, reference being had to the accompanying drawings, formingpart of this specification, and in which- Figure 1 shows a sectionalelevation of my invention.

Figure 2, a plan of the top of the same. l

Like letters refer to the same parts.

My invention has for its object the providing of a more convenientmethod than that now employed for adapting the bottom of a plane tocurved surfaces, either concave or convex. In the accompanying drawings-A shows a curved handle or stock, ot' the form indicated. B, iig. 1,shows a screw passing through the centre thereofl and attached tothepiece d. The cutting-iron, of the common form, is represented at e, andheld in position by set-screws, fitting into slots therein and workinginto the inclined portion of the piece d. The set-screws and slots areseen at t s, fig. 2. The cutting-iron also passes through an aperture inthe piece 0l. This is seen in lig. 1, at n. The piece d is rmly andrigidly attached to the sheet m on its upper or inner side, at thecentre'thereof. The sheet m is secured to the ends of' the curved handleor stock A by means of pivots or bolts, upon which it turns when bent.This is illustrated in fig.'1. The object of the piece d is to hold theend of the screw B and secure the cutting-iron in the manner abovedescribed. The space D is made in the curved stock or handle in order toadmit ofthe insertion, adjustment, or removal of the cutting-iron e.Turning the screw B by means of the crank e, the sheet m is bent andretained in the positions indicated by the dotted lines in -fig. 1, orat places intermediate between these two.

I am aw'are of the issue of Letters Patent to George F. Evans, but hisinvention is di'erent from mine in several particulars.

I do not claimA a graduating plane stock, combining, with atlexiblesheet of metal for the bottom, two shanks and two set-screws for bendingand retaining in position the same, and the sheet being secured at itscentre to the middle of the stock, and bent at the ends thereof. I amalso aware of a patent granted to the same which combines, with abearing plate, two screws, two traversing nuts thereon, and twoconnecting-rods, the plate bein-g attached to the stock, and beingcurved in a similar. manner and at the same points as the one rstmentioned. I do not claim such a method of imparting curvature to theplate, or the screws, traversingnuts and connecting-rods, by which thecurvature is given. My invention, further, differs from the subject ofLetters Patent granted to the same, and numbered 41,983, whichl combineswith a spring-face plate the construction of two connecting-rods andtheir receiving parts of the stock curved. The subject of Letters Patentgranted to William A. Gole, June 6., I848,.consists of an ordinary planewith a convex face cut thereupon, to which, at the centre, is attached ametal plate, which is bent by means of slides attached to the `endsthereof, said slides passing up against the front and back ofthee-plane. I do not claim a device of this description. The rejectedapplication of Simon Williams, received and filed August 12,1852,describes a plane stock, wherein the metal plate is secured to the stockat the centre thereof and at the centre of the plate, and the plate isbent by means of adjusting screws turned to the right or left andbending the plate from its ends. This is diierent from my invention inarrangement land operation, and I do not claim a device of thischaracter. My invention is distinct from all ofthose above referred to,in having the {lexible plate united at its ends to the ends of' a curvedstocln'oi` the form delineated in the drawing, and, in both, receivingits curvature and being held at any desired curve by a vertical screwturned by a crank, and the screw being connected with the plate at thepiece cl.

What I claim as my invention, and desire to secure by Letters Patent,is-

The arrangement ot' the screw B, in combination with the joints orpivots by which the sheet m is connected at its ends to the ends ofthehandle or stock A, as and for the purposes herein described.

CHS. I-I. SAWYER.

Witnesses:

WILLIAM H; CLIFFORD, HENRY C. HOUSTON.

